Stadium: Court 2 Round: 14 Ground: Clay
| Challenger Seville | 2021/09/07 10:50 | Gian Marco Moroni v Nicola Kuhn | 7-6,6-1 |
| Challenger Meerbusch | 2021/08/10 08:30 | Nicola Kuhn v Nick Hardt | 6-4,6-3 |
| ATP Hamburg | 2021/07/12 10:30 | Nicola Kuhn v Thiago Seyboth Wild | 6-1,1-6,2-6 |
| Challenger Braunschweig | 2021/07/07 11:40 | Nicola Kuhn v Henri Laaksonen | 4-6,5-7 |
| Challenger Braunschweig | 2021/07/06 15:25 | Nicola Kuhn v Mischa Zverev | 6-2,7-6 |
| Challenger Porto | 2021/06/29 12:50 | Nicola Kuhn v Emilio Gomez | 5-7,2-6 |
| ATP Mallorca | 2021/06/21 17:10 | Nicola Kuhn v Feliciano Lopez | 1-6,6-7 |
| ATP Mallorca | 2021/06/20 11:30 | Radu Albot v Nicola Kuhn | 6-7,4-6 |
| Challenger Nottingham | 2021/06/06 10:00 | Nathaniel Lammons v Borna Gojo | 6-7,7-6,4-6 |
| Challenger Cherbourg | 2021/02/10 10:00 | Denis Istomin v Nathaniel Lammons | 6-3,5-7,6-4 |
| Challenger Cherbourg | 2021/02/08 10:00 | Vladyslav Orlov v Nathaniel Lammons | 4-6,4-6 |
| Challenger Cherbourg | 2021/02/07 11:00 | Nathaniel Lammons v Maxime Hamou | 6-2,6-3 |
| Challenger Cleveland | 2020/02/10 14:00 | Ruan Roelofse v Nathaniel Lammons | 6-4,6-4 |
| Challenger Savannah | 2019/04/29 14:00 | Ricardo Rodriguez-Pace v Nathaniel Lammons | 6-1,6-4 |
| Challenger Houston | 2018/11/10 22:00 | Julian Lenz v Nathaniel Lammons | 4-6,6-1,6-4 |
| Challenger Knoxville | 2018/11/05 17:30 | Denis Yevseyev v Nathaniel Lammons | 6-2,6-1 |